But it is true that coyotes will kill pets. My ex-husband has a farm. One of the cats is three-legged from a coyote attack. Some of former students told me of encountering coyotes that seemed aggressive toward them.
I've seen coyotes running thru subdivisions here locally. I do know I wouldn't want a den in my yard! But I'd even be scared of going out to fill in the den, as, for instance, could there be pups down inside, and cause aggression on the part of the mama.?